If, and thats a big if Doomsday if in the next movie, I want him to be a degenerated, mutated clone of Supes. Stick with the same backstory, that he was a genetic experiment, and everytime he dies, he is immune to dying again that way, etc. However, make the initial genetic material be Supe's.
Maybe Jor-El kept a sample of Supes' genetic material before he sent him to Earf, and some residents of a yellow-sun orbiting planet took it and started the process that created Dooms.
Not popular, and I am sure I will get flamed, but it lets Singer do a "Supes vs. Supes" fight like in the previous movies, just modernized.

my thought would be that the main villian would be brainiac and just before Superman destroys him brainiac unleashes doomsday from his ship. Superman then destroys brainiacs circuits, then all hell breaks loose. (I posted this on the fan art section but this is my version of doomsday)

The trailer for Supermanoomsday already looks like it will easily own Superman Returns, so Im gonna say screw it, lets just adapt the Doomsday/death of Superman story to the big screen and make film with rollercoaster like emotion and action. I do not care one damn bit about following up on Superman Returns storyline, find a new Director, recast the parts, and make the film. Im tired of folks dicking off with Superman.

This is a rant....

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LOST- 2004-2010: "The most important part of your life was the time you spent with these people. "

The Death of Superman storyline was the fad of the 90's and will never make it's way on screen. That's why it was developed as an animated feature. Superman Returns practically killed Superman twice, I don't think you'll see that on screen if this arc is continued.

Well, I think that a Death of Superman film, but streamlined like with the animated feature, without the Supermen etc., could've been a very good film. It would've been another good way to develop the characters and at the same time they could've done something fresh and new. I'm anticipating Superman: Doomsday more than the Superman Returns sequel and that means something, especially since I like SR.

You can do things alot easier in a cartoon that a feature film. Like you can draw anything whereas to create it in a film costs shed-loads. Not to mention that you can draw say Doomsday whereas in a film you have to use makeup and CG, etc and you have to worry that it will look corny. Making a cartoon is much easier.

bad idea -- doomsday is a pretty bland character, imho. of all the villains in the super-hero world, i'd say doomsday has the least interesting and most poorly developed backstory. i'm all for villains, but even the bad guys need to have some reason for being evil -- the notion of an indestructible killer in traditional superhero comics can work (though even this i'd argue wouldn't work in this day and age) but on the big screen, a little more substance is appreciated.

Well the "Death of Superman" storyline (or a variation of it) was intially going to be the idea for a resurrected Superman franchise for the better part of the 1990's, but it just never got off the ground. WB felt that with the success of the comic book series, as well as the TPB, adapting that particular storyline would definately be the smart way to go considering a good number of people were already familiar with it. Considering what has taken place in recent years with the Superman live action film franchise, the story being adapted in animated form is IMO, the best option for right now.

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"Option A: You talk, we listen, no pain. Option B: You don't talk, I remove your thumbs with my pliers, it will hurt. Option C: I like to vary the details a bit, but the punchline is ... you die."

The trailer for Supermanoomsday already looks like it will easily own Superman Returns, so Im gonna say screw it, lets just adapt the Doomsday/death of Superman story to the big screen and make film with rollercoaster like emotion and action. I do not care one damn bit about following up on Superman Returns storyline, find a new Director, recast the parts, and make the film. Im tired of folks dicking off with Superman.

I don't get the comparison, Richard Pryor made it to screen when he was popular. The Death of Superman storyline was a product of the 90's, plus they just made it into an animated feature. Nope sir. Don't get it.

Superman: Doomsday is a good concept BUT why the short running time?!? It's only 75 mins, that's kinda under-developed or rushed don't you think?

I mean if it's gonna be based on the comic books (Death Of Superman, World without Superman, Return of Superman, etc.), it's gotta have:

1.Doomsday's introduction
2.His reign of terror in the city
3.The JLA learning about Doomsday and eventually fighting him with Supes
4.JLA defeated, except Supes the last one standing
5.Supes one on one with Doomsday
6.The world and the JLA coping with his loss
7.The characters claiming they are Superman
8.Return of Superman
9.Battle with Doomsday again

Not to mention, it's gotta have substance. So if indeed it's only 75 mins, I think the makers are gonna stray away from the comics or make their own interpretation. BUT I really love to see the JLA fighting with Supes and the how the world and the JLA struggle with Supes' demise. But then again, it's only 75 mins. Oh, well, still hoping it will turn out alright, crossing my fingers.

The jla are not involved in this and i dont think the reign of the supermen will happen to much(at most i see cyborg).

Well, that's a letdown for me. I was kinda hoping the JLA would somehow be involved, Superman's in the fight of his life, JLA should give him a hand. Maybe the JLA isn't formed yet in this universe. But then again, it would be cool if just a few heroes would fight with Supes against Doomsday.